Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7760595 | Optical disc device An optical disc device includes: a spindle motor for rotating a disc; a motor driving circuit for applying a voltage to the spindle motor to drive the spindle motor; an optical pickup for irradiating the disc with an optical beam; and a detector for, after the motor... | 07/20/2010 |
| 7649817 | Method and apparatus for recording and/or reproducing data A method and an apparatus for recording and/or reproducing data in which a recording and/or reproduction velocity is be reduced when a data recording and/or reproduction error occurs due to a defect of an optical disc during recording of data on and/or reproduction ... | 01/19/2010 |
| 7626903 | Optical disc apparatus and information recording and reproducing method Disclosed is an optical disc apparatus that sets a plurality of virtual zones, which correspond to a plurality of zones that are arranged in the radial direction of an optical disc, for a plurality of recording layers of the optical disc. When a servo signal distort... | 12/01/2009 |
| 7548495 | Optical storage device, recording method of optical storage medium and program A write retry processing unit repeats a write retry operation of a write and a verify, while performing a setting change of a focus offset for recording a data on an optical storage medium in case a verify error occurs in executing the write and a verify try fails. ... | 06/16/2009 |
| 7450479 | Disk recording apparatus for recording data by using zone CLV technology There is provided a disk recording apparatus capable of minimizing a servo error and recording in the last zone at the maximum one of the recording speeds specified in the apparatus or disk recording medium even if the disk recording medium is in poor condition. At ... | 11/11/2008 |
| 7423942 | Optical disc device for recording different types of optical discs and data recording method for optical disc device In an optical disc device comprising: a pickup 3 having a laser diode and generating a laser beam for recording onto an optical disc 1; a disc motor 2 that drives the rotation of an optical disc mounted thereon; a stepping motor that moves the p... | 09/09/2008 |
| 7362672 | Method and apparatus for disc rotation control in an optical storage system based on detected extent of disc warping An apparatus is provided for disc rotation control in an optical storage system, which is capable of generating a focusing error signal from light that was reflected by a loaded optical disc. The apparatus includes a focus controller for processing the focusing erro... | 04/22/2008 |
| 7352669 | Method and device for disc rotation control in an optical storage system based on detected extent of disc warping A digital signal processing device is provided for disc rotation control in an optical storage system, which is capable of generating a focusing error signal from light that was reflected by an optical disc loaded in the optical storage system. The digital signal pr... | 04/01/2008 |
| 7339862 | Optical disc driving system and method for determining rotation speed of optical disc A novel optical disc driving system and method for determining the rotation speed of an optical disc are provided, which allow to determine the highest rotation speed optimal for reading out audio and video data in the optical disc in accordance with the environment... | 03/04/2008 |
| 7304926 | Motor control system having output clamp function and method of the same A motor control system comprises a motor controller and a clamp apparatus and is used for controlling a motor apparatus. The motor controller is used for generating a motor control output according to a reference signal and a feedback signal from the motor apparatus... | 12/04/2007 |
| 7289287 | Apparatus for recording or/and reproducing information and method for reducing power consumption thereof In an apparatus for recording and/or reproducing information, which reproduces servo information being recorded on a medium and conducts a tracking operation based on the servo information, a power save part conducts a power save operation by reducing an operation c... | 10/30/2007 |
| 7266062 | Noise removal using 180-degree or 360-degree phase shifting circuit A noise removal circuit of the present invention comprises a 180-degree odd multiple shifting section for outputting a 180-degree shifted signal that is phase-shifted from an input signal by an odd multiple of 180 degrees and difference output section for outputting... | 09/04/2007 |
| 7266056 | Method of focus position adjustment by controlling a deviation value and system thereof The present invention provides a focus position adjustment method for adjusting a focus position by which an optical storage device reads an optical storage medium. The optical storage medium comprises a header and a recording area. The optical storage device genera... | 09/04/2007 |
| 7257062 | Method for detecting eccentricity of an optical disc, and optical disc drive that performs the method An optical disc drive includes a spindle motor and a computer program. The spindle motor is adapted for rotating an optical disc. The computer program configures the optical disc drive to perform consecutive steps of a method for detecting eccentricity of the optica... | 08/14/2007 |
| 7236437 | Shock detector for optical disc recorders and shock-proof recording method using shock signal A shock detector for an optical disc recorder and method for controlling the recording using a shock signal. The shock detector includes a first detecting unit for detecting the amplitude of a first kind of reference signal passing through a band-pass filter and out... | 06/26/2007 |
| 7206269 | Optical disk recording/reproducing apparatus with reduced resume time The present invention shortens a time to be elapsed from a recording interruption to a recording restart, thereby realizing a reliable recording restart. In one embodiment, an optical disk apparatus comprises an optical pickup and a processor, which includes a repro... | 04/17/2007 |
| 7158458 | Method and apparatus for recording/reproducing information with respect to optical recording medium A method and an apparatus are provided, which enable a user's standby time to be shortened or utilized effectively in the course of recording/reproduction of information with respect to an optical disk. Information recorded on a disk is reproduced preferentially, an... | 01/02/2007 |
| 7151731 | Method for controlling rotation speed of an optical storage device A method of rotation speed control for optical storage device is proposed. The method adjusts the rotation speed of an optical storage device to increase access probability and also enhance performance of the optical storage device. The method includes providing wei... | 12/19/2006 |
| 7130255 | Method of CD/DVD vibration detection by monitoring motor conditions This invention describes a method and apparatus to determine a safe rotational speed for a CD/DVD drive by detecting the amount of vibration of the disk by measuring the operating conditions of the spindle motor. A disk drive includes a motor for rotating the disk a... | 10/31/2006 |
| 7106672 | Method and apparatus for using a frequency difference to adjust a target bit for bit counting A method and apparatus for normalized bit counting is described. The method comprising incrementing a bit counter using a first clock, and adjusting a target bit based on a difference in frequency between the first clock and a second clock. The method further compri... | 09/12/2006 |
| 7099252 | Method and apparatus for removing vibration in disc drive Provided are a method and apparatus for removing vibration due to the imbalance of weight of a disc in a disc drive, in which the allowable high multi-speed of a disc is determined based on the allowable amount of vibration in the disc drive and the disc drive is ac... | 08/29/2006 |
| 7088657 | Optical media integrity detection An optical media drive contains light reflective surfaces positioned about a transparent center portion of the optical media. The light reflective surfaces reflect laser light from a laser unit of the drive which is directed toward the transparent center portions of... | 08/08/2006 |
| 7084894 | Optical disc drive focusing apparatus An optical focusing system is configured to generate a data profile, wherein the data profile is configured to provide signals for operation of an actuator. Application of the signals from the data profile results in focus of optics within a label region of an optic... | 08/01/2006 |
| 7075869 | Method and apparatus for determining applicable recording speed of a recordable optical disk Information indicative of disk-applicable recording speeds is incorporated in lead-out start time information within ATIP information that is recorded in pre-grooves located in a lead-in area of an optical disk. Once the optical disk is inserted in an optical disk r... | 07/11/2006 |
| 7072263 | Optical disc recording and playback apparatus A pickup control circuit (5) for performing a control operation of an optical pickup (3) and an error detection circuit (14) for detecting an error signal from a servo signal obtained from the pickup control circuit (5) are provided. Duri... | 07/04/2006 |
| 7062160 | Monitoring current in a motor during acceleration to verify motor frequency lock Method and apparatus for accelerating a motor from an intermediate velocity to a final operational velocity. The motor is accelerated from rest to the intermediate velocity through application of fixed duration drive pulses to the spindle motor. Once the motor reach... | 06/13/2006 |
| 7057992 | Exposure apparatus for optical disc An exposure apparatus for an optical disc used for eliminating the vibrations in the propagating direction when a rotation mechanism rotates. The slider controller 40 and the spindle controller 41 of the exposure apparatus 1 are activated, and t... | 06/06/2006 |
| 7054248 | Recording apparatus A recording apparatus having a microphone unit; and a drive unit adapted to drive a disk medium on which sound collected by the microphone unit is to be recorded. The recording apparatus is capable of changing a rotational speed of the drive unit in accordance with ... | 05/30/2006 |
| 7027368 | Motor control apparatus, disk apparatus and acceleration detection device A motor controlling device includes an acceleration detector for detecting an acceleration of a motor; a motor driver for supplying a driving current to the motor; a heat quantity calculator for calculating a heat quantity generated in the motor at least based on an... | 04/11/2006 |
| 7021355 | Disc tray error system A processor, such as a laminator for laminating a film onto a disc, such as a CD, DVD or the like has a tray for holding a disc for movement from a loading position to a processing position. The tray has a recess for receiving the disc, when the disc is properly pos... | 04/04/2006 |
| 7023770 | Encoding rate-based, programmable, linear velocity, compressed audio compact disc player An audio player permits compressed or uncompressed audio CDs to be played. The preferred player includes a spindle motor control that causes the CD to be spun at a constant linear velocity that is commensurate with the encoding rate of the file being played. In this... | 04/04/2006 |
| 7016278 | Apparatus and method for controlling recording speed of optical disc recording system A method of controlling a recording speed of an optical disc recording system includes detecting error information with respect to a level of a servo control signal of the optical disc recording system, and adjusting the recording speed of the optical disc recording... | 03/21/2006 |
| 7005817 | Energy conserving disc drive A disc drive includes a disc mounted to a rotatable spindle, a motor coupled to the spindle, and motor control circuitry. The motor has a motoring mode in which it rotates the spindle and a braking mode in which is decelerates the rotating spindle and generates powe... | 02/28/2006 |
| 6996045 | Optical disk controller which sets sampling interval according to rotational speed of optical disk The optical disk controller of this invention that reduces the frequency of output of status reports to relieve the burden of a system controller includes: a status generator for generating status reports each representing the operation state of the optical disk con... | 02/07/2006 |
| 6977477 | Systems, apparatus, and methods for motor control Systems and methods are provided through which the current to a spindle motor of the recording medium of a mass storage device is modulated to avoid anomalies in the operation of mass storage device and reduce power consumption. In the example of a disc drive, the c... | 12/20/2005 |
| 6967913 | Information processing method for achieving optimization of recording velocity An optical disk recording method comprising steps of a) performing recording onto the optical disk with a ZCLV method by using zone parameter storage means for storing at least one zone division time and CLV of each zone in a track formed on the optical disk, as zon... | 11/22/2005 |
| 6965548 | Method of unbalanced disc detection A method of unbalanced disc detection in a slim type optical drive. In the method of the present invention, the slim type optical drive obtains a first tracking count per round of the disc at a first rotation speed to obtain a first runout. Then, the optical drive o... | 11/15/2005 |
| 6963520 | Method of recording and reproducing an optical recording medium A method of recording and reproducing an optical recording medium which detects a defocus and a tilt of the optical recording medium and compensates the detected defocus and tilt in a high-density optical recording medium. In a free running state in which only a foc... | 11/08/2005 |
| 6958966 | Control device for optical disk player that corrects rotational frequency data based on input data An optical disc player having an optical pickup records and retrieves information on an optical disc while the optical disc is rotating. A rotation pulse is generated each time the optical disc rotates through a prescribed angle. A rotation frequency data representi... | 10/25/2005 |
| 6958964 | Apparatus for reproducing data from an optical disc inducing vibration and method thereof A method and apparatus for reproducing data from an optical disc in which a disc inducing vibration is detected and the speed of the disc is adjusted to an appropriate speed which does not cause vibration. The method includes obtaining the frequency of vibration by ... | 10/25/2005 |
